Every once in a while I find that I need either a bunch of large files, or  a file of a very specific size for testing, today was one of those days and after a little googleing, I found a way to easily create a file of a specific size.  I needed a file that was 10,000,000 bytes exactly to run some tests.   Step one is getting the hex equivalent of the number of bytes in the file, so I launched the windows calculator and put it into scientific mode, enter the bytes and click on hex You then need to pad the number with 0 from the left to make it 8 digits so 10MB = 00989680 Step 2 open a command prompt and enter the following -debug filename (and ignore the file not found error) -rcx and press enter -now enter the last four digits of the hex code (in this example 9680) and press enter -rbx and press enter -now enter the first four digits of the code (in this example 0098) and press enter -w enter to write the file -q enter to quit it looks something like this and when you are done you have a file like this